Chemical Elements Review
This worksheet covers fundamental concepts of chemical elements, including their properties, organization in the periodic table, and basic atomic structure for Grade 12 Chemistry.
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Chemical Elements Review
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Read each question carefully and answer to the best of your ability. Show all work for calculations.
1. Which of the following best describes an isotope?
Atoms of the same element with different numbers of protons.
Atoms of different elements with the same number of neutrons.
Atoms of the same element with different numbers of neutrons.
Ions of the same element with different charges.
2. Which group of elements is characterized by having a full outer electron shell, making them largely unreactive?
Alkali Metals
Halogens
Transition Metals
Noble Gases
3. The atomic number of an element is determined by the number of in its nucleus.
4. Elements in the same (row) of the periodic table have the same number of electron shells.
5. The most electronegative element on the periodic table is .
6. Explain the trend of atomic radius across a period and down a group in the periodic table.
7. Refer to the image of a periodic table element box below. Identify and explain the significance of each labeled part (A, B, C, D).
A:
B:
C:
D:
8. All elements are naturally occurring on Earth.
True
False
9. Metals generally have low electrical conductivity.
True
False
Match each term on the left with its definition on the right.
10. Period
a. Vertical column in the periodic table
11. Group
b. Horizontal row in the periodic table
12. Metalloid
c. Element with properties of both metals and nonmetals